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Cheap flights from Ottawa to Illinois from C$ 146

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
11 Jan — 18 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ottawa to Illinois

Enter your travel dates to find the best prices.

Cheapest flights from Ottawa to Illinois
Explore the most affordable flight options available from Ottawa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 December 2025.

Fri 26/126:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Sun 28/124:15 p.m.MDW - YOW
1 stop5h 14mPorter Airlines
Deal found 10/12C$ 563
Tue 23/128:55 p.m.YOW - ORD
2 stops36h 36mMultiple Airlines
Wed 7/17:30 a.m.ORD - YOW
1 stop15h 55mMultiple Airlines
Deal found 10/12C$ 749
Mon 22/128:40 a.m.YOW - MDW
1 stop7h 40mPorter Airlines
Fri 2/111:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 10/12C$ 764
Fri 12/127:00 a.m.YOW - ORD
1 stop18h 09mMultiple Airlines
Sun 14/129:14 p.m.ORD - YOW
2 stops26h 11mMultiple Airlines
Deal found 11/12C$ 765
Mon 29/126:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Tue 30/124:15 p.m.MDW - YOW
1 stop5h 14mPorter Airlines
Deal found 10/12C$ 775
Mon 29/129:10 a.m.YOW - ORD
2 stops14h 10mAmerican Airlines
Tue 30/129:45 a.m.ORD - YOW
1 stop6h 06mAmerican Airlines
Deal found 10/12C$ 787
Thu 25/121:20 p.m.YOW - MDW
1 stop27h 00mPorter Airlines
Sun 28/1211:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 11/12C$ 812
Mon 15/129:35 a.m.YOW - ORD
2 stops30h 37mMultiple Airlines
Mon 22/125:00 a.m.ORD - YOW
1 stop18h 25mMultiple Airlines
Deal found 10/12C$ 815
Fri 19/126:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Fri 2/111:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 9/12C$ 816
Sat 20/1212:10 p.m.YOW - MDW
1 stop4h 10mPorter Airlines
Fri 26/124:15 p.m.MDW - YOW
1 stop3h 39mPorter Airlines
Deal found 9/12C$ 825
Sun 21/1212:10 p.m.YOW - MDW
1 stop4h 10mPorter Airlines
Sun 28/124:15 p.m.MDW - YOW
1 stop5h 14mPorter Airlines
Deal found 11/12C$ 834
Mon 22/126:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Sun 28/1211:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 11/12C$ 852

Find flight deals from Ottawa to Illinois

Keep the following information in mind while searching for Ottawa to Illinois flight deals. Data was last updated 12 December 2025.

Round-trip from

C$ 334

One-way from

C$ 146

Popular in

November

Cheapest in

May

Average price

C$ 709

Good round-trip deal

C$ 524 or less

Good one-way deal

C$ 280 or less
25/1-1/2
  • 25/1-1/2
  • 4 total stops
  • 39h 57m total
  • Ottawa to Illinois
Search Deals
11/1
  • 11/1
  • 3 total stops
  • 29h 43m total
  • Ottawa to Illinois
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 146 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Ottawa to Illinois.
Search Deals
Price to beat on a one-way flight from Ottawa to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ottawa to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 12 December 2025.
Use the filters below to find and compare flights from Ottawa to Illinois that are best for you.

Fly from

Ottawa

Fly to

Illinois

Route

Depart

Return

Price

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sun 25/1

4:20 p.m.-7:38 p.m.

3 stops28h 18m

Chicago O'Hare Intl

Sun 1/2

12:44 p.m.-11:58 p.m.

1 stop10h 14m

C$ 343

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 8/1

9:30 a.m.-10:33 p.m.

1 stop14h 03m

Lambert-St Louis

Sun 11/1

5:11 p.m.-5:13 p.m.

1 stop23h 02m

C$ 401

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 8/1

5:11 p.m.-10:58 p.m.

1 stop6h 47m

Lambert-St Louis

Mon 12/1

3:11 p.m.-9:18 p.m.

1 stop5h 07m

C$ 418

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sat 24/1

9:30 a.m.-5:52 p.m.

1 stop9h 22m

Chicago O'Hare Intl

Sat 31/1

5:15 a.m.-12:25 a.m.

1 stop18h 10m

C$ 440

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 8/1

9:15 a.m.-3:29 p.m.

1 stop7h 14m

Lambert-St Louis

Mon 12/1

3:11 p.m.-9:18 p.m.

1 stop5h 07m

C$ 492

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Sun 25/1

5:40 a.m.-12:46 p.m.

2 stops8h 06m

Chicago Midway

Sun 1/2

1:00 p.m.-11:58 p.m.

1 stop9h 58m

C$ 545

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 26/12

6:50 a.m.-10:05 a.m.

1 stop4h 15m

Chicago Midway

Sun 28/12

4:15 p.m.-10:29 p.m.

1 stop5h 14m

C$ 563

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 2/1

6:50 a.m.-10:10 a.m.

1 stop4h 20m

Chicago Midway

Sun 4/1

4:15 p.m.-8:54 p.m.

1 stop3h 39m

C$ 564

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 8/1

6:00 a.m.-2:30 p.m.

2 stops9h 30m

Lambert-St Louis

Sun 11/1

6:40 p.m.-1:32 p.m.

2 stops17h 52m

C$ 585

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 8/1

5:55 p.m.-11:59 p.m.

1 stop7h 04m

Lambert-St Louis

Thu 15/1

11:20 a.m.-9:56 p.m.

2 stops9h 36m

C$ 586

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 31 results
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Best time to book a flight from Ottawa to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Ottawa with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ottawa to Illinois

What is the cheapest month to book a flight from Ottawa to Illinois?

Currently, September is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 181). Flying from Ottawa to Illinois in December is currently the most expensive (average of C$ 372). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from YOW to IL?

Find hourly flight availability from Ottawa to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 December 2025.

When flying from Ottawa to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Ottawa to Illinois

Explore weekly flight availability from Ottawa to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 12 December 2025.

The most flights from YOW to USIL are scheduled on a Tuesday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated 12 December 2025.
Read reviews from past customers who have flown Porter Airlines,United Airlines, andAir Canada from Ottawa to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
397 reviews
Check prices

Food

7.6

Comfort

8.0

Crew

8.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Porter Airlines
8.0
Very good
397 reviews
Porter Airlines
8.0
Very good
397 reviews
Check prices

Food

7.6

Comfort

8.0

Crew

8.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
United Airlines
7.4
Good
9,095 reviews
Porter Airlines
8.0
Very good
397 reviews
Check prices

Food

7.6

Comfort

8.0

Crew

8.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Air Canada
7.1
Good
10,514 reviews
Porter Airlines
8.0
Very good
397 reviews
Check prices

Food

7.6

Comfort

8.0

Crew

8.6

Boarding

8.2

Entertainment

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ottawa to Illinois?

    Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to Illinois. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.

  • How long is the flight from Ottawa to Illinois?

    United Airlines, Air Canada, and Porter Airlines can get you from Ottawa to Illinois in just under 4h 15m. Your travel time can differ by up to 2h 59m. There are 1048 km between Ottawa and Illinois. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Ottawa to Illinois?

    Most travellers choose Ottawa - Chicago O'Hare Intl, Ottawa - Chicago Midway or Ottawa - Lambert-St Louis when deciding on the best route from Ottawa to Illinois.

  • What are the most reliable airlines from Ottawa to Illinois?

    Before booking your flight to Illinois from Ottawa, check out the most reliable airlines to get you to your destination on time: SkyWest Airlines (100%), ANA (87%), Avianca( 85%).

  • What are the cheapest flights from Ottawa to Illinois?

    Looking for the cheapest flight from Ottawa to Illinois? While on average our users pay C$ 1,429, our data indicates the cheapest price to be C$ 226. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 334.

  • Can I find deals for flights from Ottawa to Illinois that include hotel bookings?

    Yes. In addition to deals on Ottawa to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Illinois.

  • Can I find deals for business class flights from Ottawa to Illinois?

    Yes. Cheapflights offers flight deals from Ottawa to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ottawa to Illinois?

    Currently, September is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 181). Flying from Ottawa to Illinois in December is currently the most expensive (average of C$ 372). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Ottawa to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Ottawa to Illinois

Discover the top 3 airlines that operate flights from Ottawa to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 12 December 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 331AverageC$ 487FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 464AverageC$ 671FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 502AverageC$ 650FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ottawa to Illinois?

Cheapflights makes it easy to find Ottawa to Illinois flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Illinois?

Cheapflights helps you find that perfect flight to Illinois from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ottawa to Illinois with no change fees?

Yes! Cheapflights helps users easily find flights from Ottawa to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Ottawa to Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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